Why so many talent trees?

[Monkey]

Monkey, I don't think that a lot of people will be going for mindflay with 500ish damage since they have to drop the reduced cast time on mana burn and mass dispell. I predict the biggest change for pvp will be people picking up surge of light. Can mana burn crit?

To the best of my knowledge, Mana Burn can't crit.

Let's not look askance at +500 damage; Although it doesn't make the damage of mindflay like that of a 'real' shadow priest, it does pair well with the kiting aspect of Mindflay to be a little surprise followup to fear for rogues, feral druids, etc. Does it outweigh the value of improved mana burn? Excellent question--we'll see what the Arena decides.:)